Pulmonology Practice Questions

Q: Which test is most sensitive for screening/detecting pulmonary involvement in sarcoidosis?

Chest X-ray. A **chest X-ray** is the most widely available and often the initial imaging modality performed in suspected sarcoidosis, showing characteristic patterns such as **bilateral hilar lymphadenopathy** [1]. While not confirmatory, its high sensitivity in detecting pulmonary involvement makes it a crucial preliminary diagnostic tool, especially given the frequency of lung involvement in sarcoidosis [1]. *Bronchoalveolar lavage* - **Bronchoalveolar lavage (BAL)** can show **lymphocytosis** with a high CD4/CD8 ratio, which is suggestive but not specific for sarcoidosis. - While supportive, BAL is an invasive procedure and less commonly the **initial diagnostic test** compared to a chest X-ray. *Serum ACE levels* - **Elevated serum angiotensin-converting enzyme (ACE)** levels can be found in sarcoidosis, reflecting granulomatous activity, but are neither sensitive nor specific enough for diagnosis. - ACE levels are elevated in only about **60% of patients** with active sarcoidosis and can be normal even in widespread disease, or elevated in other conditions. *Skin biopsy* - **Skin biopsy** can reveal **non-caseating granulomas** if there are cutaneous manifestations of sarcoidosis, which occur in about 20-30% of patients. - While diagnostic when positive, its use is limited to patients with **visible skin lesions** and it is not a screening test for systemic disease.

Q: A 50-year-old male presents with cyanosis and is diagnosed with chronic obstructive pulmonary disease (COPD). What is the primary mechanism causing his cyanosis?

Chronic hypoxemia. ***Chronic hypoxemia*** - **Chronic hypoxemia** is a hallmark of severe COPD, leading to insufficient oxygen in the arterial blood, which is the direct cause of cyanosis. [1] - The body compensates for ongoing hypoxemia by increasing **red blood cell production (polycythemia)**, which, when deoxygenated, becomes more visible as a bluish discoloration of the skin and mucous membranes. *Low cardiac output* - While low cardiac output can impair tissue oxygen delivery, it typically presents with signs of **poor perfusion** (e.g., cool extremities, altered mental status) rather than primary cyanosis in the absence of severe respiratory compromise. - In COPD, the primary issue is impaired gas exchange in the lungs, not usually a profound cardiac dysfunction leading to cyanosis, unless comorbid heart failure is present. *Carbon monoxide poisoning* - **Carbon monoxide (CO)** binds to hemoglobin with a much higher affinity than oxygen, forming carboxyhemoglobin, which is bright red. [3] - This typically leads to a **cherry-red appearance** rather than cyanosis, even in the presence of severe tissue hypoxia. [2] *Right-to-left shunt* - A **right-to-left shunt** allows deoxygenated blood to bypass the lungs and enter the systemic circulation, causing hypoxemia and cyanosis. [1] - While shunting can occur in severe COPD (e.g., due to ventilation-perfusion mismatch), the primary mechanism for generalized chronic cyanosis in COPD is the overall failure of the lungs to adequately oxygenate blood, classifying it as **chronic hypoxemia** rather than a specific anatomical shunt.

Q: A 55-year-old male with a history of bronchiectasis presents with acute onset of massive hemoptysis. What is the most appropriate immediate intervention?

Bronchoscopy. ***Bronchoscopy*** - **Bronchoscopy** is the immediate and most appropriate intervention for **massive hemoptysis** to localize the bleeding site, achieve hemostasis (e.g., with balloon tamponade), and protect the airway. - In a patient with **bronchiectasis**, damaged airways are prone to bleeding, making precise localization and control critical [1], [2]. *Thoracotomy* - **Thoracotomy** is a surgical procedure typically reserved for cases where bronchoscopic interventions fail to control life-threatening hemorrhage or when the bleeding source is inoperable via bronchoscopy. - It is a more invasive option and not the first-line immediate intervention for acute management. *Intravenous corticosteroids* - **Intravenous corticosteroids** are used to reduce inflammation in certain pulmonary conditions, but they do not directly address acute bleeding in massive hemoptysis. - They would not be an immediate intervention for stopping active hemorrhage and might even have adverse effects in an acutely ill patient. *Antibiotics* - **Antibiotics** treat bacterial infections, which can sometimes trigger hemoptysis, particularly in bronchiectasis. - While an infection might be an underlying cause, antibiotics alone will not stop **massive hemoptysis** acutely and are secondary to airway management and hemorrhage control [1].

Q: A 55-year-old male presents with chronic cough and dyspnea. He has a 40-pack-year smoking history. His chest CT shows emphysematous changes. What is the most appropriate pharmacologic management?

Long-acting beta-agonists. ***Long-acting beta-agonists*** - **Long-acting beta-agonists (LABAs)** are a cornerstone of COPD management, providing sustained bronchodilation to improve airflow and reduce symptoms like dyspnea and cough in patients with **emphysema and a smoking history**. [1] - They are recommended for regular use to improve lung function, reduce exacerbation frequency, and enhance quality of life in patients with **stable COPD**. [1] *Inhaled corticosteroids* - **Inhaled corticosteroids (ICS)** are generally reserved for patients with severe COPD (FEV1 < 50% predicted) and a history of frequent exacerbations, especially if they have features of asthma-COPD overlap or high eosinophil counts, which are not specified here. - While they can reduce exacerbations, their long-term monotherapy in COPD is discouraged due to potential side effects like pneumonia, and they are typically added to bronchodilators, not used as first-line monotherapy. *IV antibiotics* - **Intravenous antibiotics** are indicated for acute bacterial exacerbations of COPD, especially in severe cases or hospitalizations, to target bacterial infections. - There is no mention of an acute exacerbation, fever, increased purulent sputum, or other signs of infection that would warrant immediate antibiotic therapy in this chronic presentation. *Short-acting beta-agonists* - **Short-acting beta-agonists (SABAs)** like albuterol provide quick relief of bronchodilation but have a short duration of action, making them suitable as **rescue medications** for acute symptom relief. [1] - They are not appropriate for chronic, daily management as first-line monotherapy in stable COPD due to their limited duration of effect and high frequency of use required, which contrasts with the need for sustained symptom control. [1]

Q: Which of the following is the most common cause of hemoptysis in developed countries?

Bronchitis. ### Bronchitis - **Acute and chronic bronchitis** are the **most common causes of hemoptysis** in developed countries due to inflammation and irritation of the bronchial mucosa, leading to coughing and rupture of superficial blood vessels [3]. - The hemoptysis is typically **mild to moderate**, often described as blood-streaked sputum. *Pulmonary embolism* - While pulmonary embolism can cause hemoptysis, it is usually associated with **pulmonary infarction** and is **less common** than bronchitis as a cause of hemoptysis [1]. - Patients typically present with sudden onset **dyspnea**, **pleuritic chest pain**, and sometimes **tachycardia** or **hypoxia** [1]. *Lung cancer* - **Lung cancer** is a significant cause of hemoptysis, especially in **smokers** over 40 years old, but it is **not the most common cause overall** [2]. - Hemoptysis due to lung cancer can range from **streaky sputum to massive hemorrhage**, often accompanied by weight loss, persistent cough, and dyspnea [3]. *Tuberculosis* - **Tuberculosis** is a prominent cause of hemoptysis, particularly in **endemic regions** and among specific risk groups (e.g., immunocompromised individuals). - While important globally, it is **less common as the primary cause** in developed countries compared to bronchitis, and typically presents with chronic cough, fever, night sweats, and weight loss.

Q: A 60-year-old male presents with sudden onset of pleuritic chest pain and dyspnea. Chest X-ray shows a wedge-shaped opacity in the lung. What is the most likely diagnosis?

Pulmonary embolism. ***Pulmonary embolism*** - The sudden onset of **pleuritic chest pain** and **dyspnea** in a 60-year-old closely aligns with a pulmonary embolism. - A **wedge-shaped opacity** on chest X-ray, known as a **Hampton's hump**, is a classic but rare finding in pulmonary embolism, representing an area of pulmonary infarction. *Pneumonia* - While pneumonia can cause **pleuritic chest pain** and **dyspnea**, its onset is usually more gradual, and it's frequently accompanied by fever, cough with sputum, and signs of infection. - Chest X-rays in pneumonia typically show **lobar consolidation** or infiltrates rather than a distinct wedge-shaped opacity. *Lung cancer* - Lung cancer usually presents with **chronic symptoms** such as persistent cough, weight loss, and hemoptysis, developing over months to years. - While a mass or nodule could appear on X-ray, a **sudden onset** of severe pleuritic pain is not typical, nor is a distinct wedge-shaped opacity. *Pneumothorax* - A pneumothorax presents with **sudden pleuritic chest pain** and **dyspnea**, similar to a pulmonary embolism. - However, a chest X-ray would show the **absence of lung markings** in the affected area and a **collapsed lung**, not a wedge-shaped opacity.

Q: All of the following can cause a chronic cough EXCEPT which of the following?

Acute bronchitis. ***Acute bronchitis*** - This condition is characterized by a **self-limiting inflammatory process** of the bronchi, typically lasting **1 to 3 weeks** [1]. - While it causes a cough, it is, by definition, an **acute condition** and does not lead to a chronic cough [1]. *Chronic bronchitis* - Defined by a cough that is present for at least **3 months of the year for 2 consecutive years**. - It is a significant cause of chronic cough, often associated with **smoking** and exposure to pollutants. *ACE inhibitors* - A common side effect of **angiotensin-converting enzyme (ACE) inhibitors** is a persistent dry cough, which can be chronic. - This cough is thought to be due to the accumulation of **bradykinin** and **substance P** in the airways. *GERD* - **Gastroesophageal reflux disease (GERD)** can cause a chronic cough, even in the absence of typical heartburn symptoms. - Refluxed stomach acid can irritate the **esophagus** and trigger a **vagal reflex**, leading to coughing.

Q: A patient with a history of chronic bronchitis presents with peripheral cyanosis and bilateral leg swelling. Which pathophysiological mechanism is most likely responsible?

Pulmonary hypertension leading to right-sided heart failure. Detailed pathophysiological mechanism: Pulmonary hypertension leading to right-sided heart failure. Chronic bronchitis causes hypoxia, leading to pulmonary vasoconstriction and pulmonary hypertension. This increased pressure overworks the right ventricle, causing it to fail and resulting in peripheral edema (leg swelling) and cyanosis due to poor oxygenation [3]. Decreased hemoglobin concentration: A low hemoglobin concentration (anemia) would primarily cause pallor and fatigue, not typically peripheral cyanosis [2]. While anemia can exacerbate symptoms in heart failure, it's not the primary cause of cyanosis or leg swelling in chronic bronchitis. Increased arterial oxygen saturation: Increased arterial oxygen saturation would alleviate cyanosis, not cause it. Chronic bronchitis is characterized by impaired gas exchange and reduced oxygen saturation [4]. Venous stasis: Venous stasis can cause leg swelling, but it is usually a consequence of conditions like right-sided heart failure, not the primary pathophysiological mechanism [1]. It would not explain the peripheral cyanosis in the context of chronic bronchitis.

Q: A 48F, COPD history is admitted with increasing dyspnea and cyanosis. Blood gas analysis reveals pH 7.32, PaCO2 60 mmHg, and PaO2 50 mmHg. Most appropriate management step?

Initiate NIPPV. ***Initiate NIPPV*** - The patient's **pH 7.32 (acidemia)**, **PaCO2 60 mmHg (hypercapnia)**, and **PaO2 50 mmHg (hypoxemia)** indicate **acute hypercapnic respiratory failure** in the context of COPD exacerbation [1], [2]. - **Non-invasive positive pressure ventilation (NIPPV)**, such as BiPAP, is the cornerstone of managing acute exacerbations of COPD with respiratory acidosis, as it improves gas exchange and reduces work of breathing without the risks of intubation. *Administer intravenous antibiotics* - While infections are a common trigger for COPD exacerbations and antibiotics may be indicated, treating **respiratory failure** with antibiotics alone is insufficient and does not address the immediate life-threatening gas exchange abnormality. - Antibiotics are a supportive measure, but not the **most appropriate initial management step** for this degree of respiratory acidosis and hypoxemia. *Provide high-flow oxygen therapy* - Administering **high-flow oxygen** in a patient with COPD and **hypercapnic respiratory failure** may worsen hypercapnia by blunting the hypoxic drive and increasing V/Q mismatch [3], [4]. - While supplemental oxygen is necessary to treat hypoxemia, aggressive oxygen therapy without ventilatory support in this context can be detrimental if not closely monitored for CO2 retention [3]. *Immediate intubation and mechanical ventilation* - **Immediate intubation** is an invasive procedure with associated risks and is typically reserved for patients who fail NIPPV, have contraindications to NIPPV, or present with severe, life-threatening respiratory distress (e.g., altered mental status, hemodynamic instability, severe acidosis unresponsive to initial measures). - Given the patient's current ABG, **NIPPV** should be trialed first as it is a less invasive and often effective intervention for this presentation [1].

Q: A 55-year-old male presents with a chronic cough and weight loss. A chest X-ray reveals a mass in the right lung apex. Which syndrome is most likely associated with this finding?

Pancoast syndrome. ***Pancoast syndrome*** - **Pancoast syndrome** is characterized by a tumor (often a **non-small cell lung carcinoma**) located in the **superior sulcus** (apex) of the lung. - This tumor compresses surrounding structures, typically causing shoulder pain, weakness/atrophy of hand muscles, and **Horner's syndrome** due to involvement of the sympathetic ganglia. *Horner's syndrome* - **Horner's syndrome** is a *component* of Pancoast syndrome, caused by damage to the **sympathetic nerve pathway**. - It presents with ipsilateral **ptosis** (drooping eyelid), **miosis** (constricted pupil), and **anhidrosis** (absence of sweating) on the affected side of the face. *Cushing's syndrome* - **Cushing's syndrome** is an **endocrine disorder** caused by prolonged exposure to high levels of cortisol, often due to an adrenal tumor or **ectopic ACTH production** (e.g., from small cell lung cancer) [1]. - It presents with central obesity, moon facies, striae, and hypertension, not typically a lung mass in the apex [2]. *Carcinoid syndrome* - **Carcinoid syndrome** results from the excessive secretion of **serotonin** and other vasoactive substances by **neuroendocrine tumors**, most commonly in the GI tract or lungs. - Symptoms include flushing, diarrhea, bronchospasm, and valvular heart disease, which are not described in this patient.

Question 1

Which test is most sensitive for screening/detecting pulmonary involvement in sarcoidosis?

Accepted Answer

Chest X-ray

Answer

Bronchoalveolar lavage

Answer

Serum ACE levels

Answer

Skin biopsy

Question 2

A 50-year-old male presents with cyanosis and is diagnosed with chronic obstructive pulmonary disease (COPD). What is the primary mechanism causing his cyanosis?

Accepted Answer

Chronic hypoxemia

Answer

Low cardiac output

Answer

Carbon monoxide poisoning

Answer

Right-to-left shunt

Question 3

A 55-year-old male with a history of bronchiectasis presents with acute onset of massive hemoptysis. What is the most appropriate immediate intervention?

Accepted Answer

Bronchoscopy

Answer

Thoracotomy

Answer

Intravenous corticosteroids

Answer

Antibiotics

Question 4

A 55-year-old male presents with chronic cough and dyspnea. He has a 40-pack-year smoking history. His chest CT shows emphysematous changes. What is the most appropriate pharmacologic management?

Accepted Answer

Long-acting beta-agonists

Answer

Inhaled corticosteroids

Answer

IV antibiotics

Answer

Short-acting beta-agonists

Question 5

Which of the following is the most common cause of hemoptysis in developed countries?

Accepted Answer

Bronchitis

Answer

Pulmonary embolism

Answer

Lung cancer

Answer

Tuberculosis

Question 6

A 60-year-old male presents with sudden onset of pleuritic chest pain and dyspnea. Chest X-ray shows a wedge-shaped opacity in the lung. What is the most likely diagnosis?

Accepted Answer

Pulmonary embolism

Answer

Pneumonia

Answer

Lung cancer

Answer

Pneumothorax

Question 7

All of the following can cause a chronic cough EXCEPT which of the following?

Accepted Answer

Acute bronchitis

Answer

ACE inhibitors

Answer

GERD

Answer

Chronic bronchitis

Question 8

A patient with a history of chronic bronchitis presents with peripheral cyanosis and bilateral leg swelling. Which pathophysiological mechanism is most likely responsible?

Accepted Answer

Pulmonary hypertension leading to right-sided heart failure

Answer

Decreased hemoglobin concentration

Answer

Increased arterial oxygen saturation

Answer

Venous stasis

Question 9

A 48F, COPD history is admitted with increasing dyspnea and cyanosis. Blood gas analysis reveals pH 7.32, PaCO2 60 mmHg, and PaO2 50 mmHg. Most appropriate management step?

Accepted Answer

Initiate NIPPV

Answer

Administer intravenous antibiotics

Answer

Provide high-flow oxygen therapy

Answer

Immediate intubation and mechanical ventilation

Question 10

A 55-year-old male presents with a chronic cough and weight loss. A chest X-ray reveals a mass in the right lung apex. Which syndrome is most likely associated with this finding?

Accepted Answer

Pancoast syndrome

Answer

Horner's syndrome

Answer

Cushing's syndrome

Answer

Carcinoid syndrome

Pulmonology — MCQs

Pulmonology — MCQs

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